/// <summary>
/// ReadObject wraps the loop to read each property in an object and call the corresponding
/// setter to set it.
/// </summary>
/// <remarks>
/// This works for classes only, as the instance can't be passed by ref.
/// Structs can serialize as arrays or directly implement the loop to decode themselves.
/// Setters take a reference to the instance so that the Dictionary can be static per type,
/// which is critical for acceptable performance.
/// </remarks>
/// <typeparam name="T">Type being deserialized</typeparam>
/// <param name="reader">ITreeReader being read from</param>
/// <param name="instance">T instance being initialized</param>
/// <param name="setters">Dictionary of setter per field name</param>
/// <param name="throwOnUnknown">Throw if property name not in setters found</param>
public static void ReadObject <T>(this ITreeReader reader, T instance, Dictionary <string, Setter <T> > setters, bool throwOnUnknown = true) where T : ITreeSerializable
{
// Ensure object state reset before Read
instance.Clear();
reader.Expect(TreeToken.StartObject);
reader.Read();
while (reader.TokenType == TreeToken.PropertyName)
{
string propertyName = reader.ReadAsString();
reader.Read();
if (setters.TryGetValue(propertyName, out Setter <T> setter))
{
setter(reader, instance);
reader.Read();
}
else
{
if (throwOnUnknown)
{
throw new IOException($"Found unknown {typeof(T).Name} property, \"{propertyName}\", expected one of \"{String.Join("; ", setters.Keys)}\" at {reader.Position:n0} using {reader.GetType().Name}.");
}
else
{
reader.Skip();
}
}
}
reader.Expect(TreeToken.EndObject);
// EndObject must be left for caller to handle
}
/// <summary>
/// Read existing items in an existing Dictionary instance.
/// Used with Dictionaries of specific things which may or may not be present in the file, like Table.Columns.
/// </summary>
/// <typeparam name="T">Type of values in Dictionary</typeparam>
/// <param name="reader">ITreeReader to read from</param>
/// <param name="dictionary">Dictionary containing items to read</param>
/// <param name="throwOnUnknown">True to throw for property name not in Dictionary, false to quietly skip over it</param>
public static void ReadDictionaryItems <T>(this ITreeReader reader, Dictionary <string, T> dictionary, bool throwOnUnknown = true) where T : ITreeSerializable
{
reader.Expect(TreeToken.StartObject);
reader.Read();
while (reader.TokenType == TreeToken.PropertyName)
{
string itemName = reader.ReadAsString();
reader.Read();
if (dictionary.TryGetValue(itemName, out T item))
{
item.Read(reader);
reader.Read();
}
else
{
if (throwOnUnknown)
{
throw new IOException($"Found unknown {typeof(T).Name} property \"{itemName}\", expected one of \"{String.Join("; ", dictionary.Keys)}\" at {reader.Position:n0} using {reader.GetType().Name}.");
}
else
{
reader.Skip();
}
}
}
reader.Expect(TreeToken.EndObject);
}
public static Dictionary <int, T> ReadIntDictionary <T>(this ITreeReader reader, Func <T> ctor) where T : ITreeSerializable
{
if (reader.TokenType == TreeToken.Null)
{
return(null);
}
Dictionary <int, T> result = new Dictionary <int, T>();
reader.Expect(TreeToken.StartArray);
reader.Read();
int[] keys = reader.ReadBlockArray <int>();
reader.Read();
reader.Expect(TreeToken.StartArray);
reader.Read();
for (int i = 0; i < keys.Length; ++i)
{
int key = keys[i];
T value = ctor();
value.Read(reader);
result[key] = value;
reader.Read();
}
reader.Expect(TreeToken.EndArray);
reader.Read();
reader.Expect(TreeToken.EndArray);
return(result);
}
public static Dictionary <string, T> ReadStringDictionary <T>(this ITreeReader reader, Func <T> ctor) where T : ITreeSerializable
{
if (reader.TokenType == TreeToken.Null)
{
return(null);
}
Dictionary <string, T> result = new Dictionary <string, T>();
reader.Expect(TreeToken.StartObject);
reader.Read();
while (reader.TokenType == TreeToken.PropertyName)
{
string key = reader.ReadAsString();
reader.Read();
T value = ctor();
value.Read(reader);
result[key] = value;
reader.Read();
}
reader.Expect(TreeToken.EndObject);
return(result);
}
public static List <T> ReadList <T>(this ITreeReader reader, Func <T> ctor) where T : ITreeSerializable
{
if (reader.TokenType == TreeToken.Null)
{
return(null);
}
List <T> result = new List <T>();
reader.Expect(TreeToken.StartArray);
reader.Read();
while (reader.TokenType != TreeToken.EndArray)
{
T item = ctor();
item.Read(reader);
result.Add(item);
reader.Read();
}
return(result);
}
public static void Basics(TreeFormat format)
{
Random r = new Random();
// Test integers with specific values (for varying length encodings)
TestIntegers(format);
// Test serialization of each primitive value type (bool, string, long, double)
Sample sample = new Sample(new Random());
sample.AssertEqual(RoundTrip <Sample>(sample, format));
// Test serialization of containers (read must leave last token of nested items so loop finds next property name properly)
SingleContainer <Sample> container = new SingleContainer <Sample>(sample);
container.AssertEqual(RoundTrip <SingleContainer <Sample> >(container, format));
// Test diagnostics doesn't throw when over Reader
TreeDiagnostics diagnostics = Diagnostics(sample, format);
// Test serialization of all supported primitive array types
RoundTripArray(new byte[] { 0, 4, 16 }, format);
RoundTripArray(new char[] { 'S', 'o', 'A' }, format);
RoundTripArray(new sbyte[] { 0, 4, 16 }, format);
RoundTripArray(new ushort[] { 0, 4, 16 }, format);
RoundTripArray(new short[] { 0, 4, 16 }, format);
RoundTripArray(new uint[] { 0, 4, 16 }, format);
RoundTripArray(new int[] { 0, 4, 16 }, format);
RoundTripArray(new ulong[] { 0, 4, 16 }, format);
RoundTripArray(new long[] { 0, 4, 16 }, format);
RoundTripArray(new float[] { 0.0f, 100.5f, -2.05f }, format);
RoundTripArray(new double[] { 0.0f, 100.5f, -2.05f }, format);
// Verify exception on (expected) unsupported type
Assert.Throws <NotSupportedException>(() => RoundTripArray(new decimal[] { 0.01M, 0.02M }, format));
// Null/Empty array handling (currently expected to come back as empty array)
RoundTripArray <byte>(null, format);
RoundTripArray <byte>(new byte[] { }, format);
// Test double Dispose handled correctly, 'Verbose == true' works, 'LeaveStreamOpen' respected
container.AssertEqual(RoundTrip(container, format, testDoubleDispose: true));
container.AssertEqual(RoundTrip(container, format, new TreeSerializationSettings()
{
LeaveStreamOpen = true
}));
container.AssertEqual(RoundTrip(container, format, new TreeSerializationSettings()
{
Verbose = true
}));
// Test null string handling
sample.Name = null;
sample.AssertEqual(RoundTrip(sample, format));
// Test settings defaulting
sample.AssertEqual(RoundTrip_NullSettings(sample, format));
// Test Skip behavior works for each primitive value
VerifySkip(sample, format);
// Test serialization details
using (MemoryStream stream = new MemoryStream())
{
TreeSerializationSettings settings = new TreeSerializationSettings()
{
LeaveStreamOpen = true
};
using (ITreeWriter writer = Writer(format, stream, settings))
{
sample.Write(writer);
}
long bytesWritten = stream.Position;
stream.Seek(0, SeekOrigin.Begin);
using (ITreeReader reader = Reader(format, stream, settings))
{
// Test 'Expect' throwing (should not be 'None' when file just opened)
Assert.NotEqual(TreeToken.None, reader.TokenType);
Assert.Throws <IOException>(() => reader.Expect(TreeToken.None));
// Test reading back as wrong type (exception from ReadObject unexpected property name)
Assert.Throws <IOException>(() => new SingleContainer <Sample>().Read(reader));
}
}
}
